HP HP-20S - Arithmetic and Storage Registers; Chain Calculations and Operator Priority

2
Arithmetic and Storage
Registers
Chain Calculations
Chain calculations do a sequence of operations without pressing (=]
after each operation. The HP-20S interprets expressions using the sys-
tem of operator priority described in the next section.
Keys: Display: Description:
750 12 (] 9,000.0000 Calculates intermedi-
ate value. PEND
annunciator is on.
360 (=] 25.0000 Completes the calcula-
tion. PEND
annunciator is off.
Operator Priority and Pending Operations
Some chain calculations might be interpreted several different ways.
For example, 9 + 12 + 3 has two interpretations:
12 9 + 12
9 + -2 = 13 2+ _
3 ot 3
22 2: Arithmetic and Storage Registers